Core pears & cut each pear into 8 sections lengthwise. Combine wine, juice, vanilla & spices in a saucepan. Put in the pears & bring to a simmer. Cover & simmer over low heat until the pears are just forktender. Combine cornstarch with enough water to dissolve it. Stir into the saucepan liquid until thickened. Remove from heat. & cool until just warm. Just before serving, combine chocolate chips & water in the top of a double boiler (Mark's note: or drop a steaming dish into a pot of water). Heat until the chocolate is smoothly melted. Arrange pear slices in two dessert bowls. Divide the chocolate between them & drizzle over the pears in a zig-zag pattern. Serve at once.